revert: remove compaction destination reminder (PR #2327)

The compacted event handler injected a system-tagged reminder into the
live query after SDK auto-compaction, which caused the agent to send
an unintended message. Reverts the four changes from #2327:

- Remove `compacted` variant from ProviderEvent union
- Restore `result` yield for compact_boundary in ClaudeProvider
- Remove compacted event handler and getAllDestinations import in poll-loop
- Remove compaction integration tests and CompactingProvider helper

Closes #2325 differently — the reminder approach is not viable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

container/agent-runner/src/integration.test.ts

@@ -295,115 +295,8 @@ describe('poll loop integration', () => {
     await loopPromise.catch(() => {});
   });
 
-  it('should inject destination reminder after a compacted event', async () => {
-    // Two destinations — required for the reminder to fire (single-destination
-    // groups have a fallback path that works without <message to="…"> wrapping).
-    getInboundDb()
-      .prepare(
-        `INSERT INTO destinations (name, display_name, type, channel_type, platform_id, agent_group_id)
-         VALUES ('discord-second', 'Discord Second', 'channel', 'discord', 'chan-2', NULL)`,
-      )
-      .run();
-
-    insertMessage('m1', { sender: 'Alice', text: 'First message' }, { platformId: 'chan-1', channelType: 'discord' });
-
-    const provider = new CompactingProvider();
-    const controller = new AbortController();
-    const loopPromise = runPollLoopWithTimeout(provider as unknown as MockProvider, controller.signal, 2500);
-
-    await waitFor(() => getUndeliveredMessages().length > 0, 2500);
-    controller.abort();
-
-    expect(provider.pushes.length).toBeGreaterThanOrEqual(1);
-    const reminder = provider.pushes.find((p) => p.includes('Context was just compacted'));
-    expect(reminder).toBeDefined();
-    expect(reminder).toContain('2 destinations');
-    expect(reminder).toContain('discord-test');
-    expect(reminder).toContain('discord-second');
-    expect(reminder).toContain('<message to="name">');
-
-    await loopPromise.catch(() => {});
-  });
-
-  it('should NOT inject destination reminder with a single destination', async () => {
-    insertMessage('m1', { sender: 'Alice', text: 'First message' }, { platformId: 'chan-1', channelType: 'discord' });
-
-    const provider = new CompactingProvider();
-    const controller = new AbortController();
-    const loopPromise = runPollLoopWithTimeout(provider as unknown as MockProvider, controller.signal, 2500);
-
-    await waitFor(() => getUndeliveredMessages().length > 0, 2500);
-    controller.abort();
-
-    // Only the original prompt push (if any) — no reminder, since beforeEach
-    // seeds exactly one destination.
-    const reminders = provider.pushes.filter((p) => p.includes('Context was just compacted'));
-    expect(reminders).toHaveLength(0);
-
-    await loopPromise.catch(() => {});
-  });
 });
 
-/**
- * Provider that emits a single compacted event mid-stream, then returns a
- * result. Captures every push() call so tests can assert on the injected
- * reminder content.
- */
-class CompactingProvider {
-  readonly supportsNativeSlashCommands = false;
-  readonly pushes: string[] = [];
-
-  isSessionInvalid(): boolean {
-    return false;
-  }
-
-  query(_input: { prompt: string; cwd: string }) {
-    const pushes = this.pushes;
-    let ended = false;
-    let aborted = false;
-    let resolveWaiter: (() => void) | null = null;
-
-    async function* events() {
-      yield { type: 'activity' as const };
-      yield { type: 'init' as const, continuation: 'compaction-test-session' };
-      yield { type: 'activity' as const };
-      yield { type: 'compacted' as const, text: 'Context compacted (50,000 tokens compacted).' };
-
-      // Wait for poll-loop to push the reminder (or end / abort)
-      await new Promise<void>((resolve) => {
-        resolveWaiter = resolve;
-        // Belt-and-braces: don't hang forever if the reminder never arrives
-        setTimeout(resolve, 200);
-      });
-
-      yield { type: 'activity' as const };
-      yield { type: 'result' as const, text: '<message to="discord-test">ack</message>' };
-      while (!ended && !aborted) {
-        await new Promise<void>((resolve) => {
-          resolveWaiter = resolve;
-          setTimeout(resolve, 50);
-        });
-      }
-    }
-
-    return {
-      push(message: string) {
-        pushes.push(message);
-        resolveWaiter?.();
-      },
-      end() {
-        ended = true;
-        resolveWaiter?.();
-      },
-      abort() {
-        aborted = true;
-        resolveWaiter?.();
-      },
-      events: events(),
-    };
-  }
-}
-
 // Helper: run poll loop until aborted or timeout
 async function runPollLoopWithTimeout(provider: MockProvider, signal: AbortSignal, timeoutMs: number): Promise<void> {
   return Promise.race([

container/agent-runner/src/poll-loop.ts

@@ -1,4 +1,4 @@
-import { findByName, getAllDestinations, type DestinationEntry } from './destinations.js';
+import { findByName, type DestinationEntry } from './destinations.js';
 import { getPendingMessages, markProcessing, markCompleted, type MessageInRow } from './db/messages-in.js';
 import { writeMessageOut } from './db/messages-out.js';
 import { getInboundDb, touchHeartbeat, clearStaleProcessingAcks } from './db/connection.js';
@@ -378,23 +378,6 @@ async function processQuery(
         if (event.text) {
           dispatchResultText(event.text, routing);
         }
-      } else if (event.type === 'compacted') {
-        // The SDK auto-compacted the conversation. After compaction the
-        // model often drops the learned `<message to="…">` wrapping
-        // discipline (the destinations are still in the system prompt,
-        // but the behavioral pattern is summarized away). Inject a
-        // reminder back into the live query so the next turn re-anchors
-        // on the destination model. Only do this when there's >1
-        // destination — single-destination groups have a fallback that
-        // works without wrapping. See nanocoai/nanoclaw#2325.
-        const destinations = getAllDestinations();
-        if (destinations.length > 1) {
-          const names = destinations.map((d) => d.name).join(', ');
-          query.push(
-            `[system] Context was just compacted. Reminder: you have ${destinations.length} destinations (${names}). ` +
-              `Use <message to="name"> blocks to address them. Bare text goes to the scratchpad fallback only.`,
-          );
-        }
       }
     }
   } finally {
@@ -421,9 +404,6 @@ function handleEvent(event: ProviderEvent, _routing: RoutingContext): void {
     case 'progress':
       log(`Progress: ${event.message}`);
       break;
-    case 'compacted':
-      log(`Compacted: ${event.text}`);
-      break;
   }
 }
 

container/agent-runner/src/providers/claude.ts

@@ -336,7 +336,7 @@ export class ClaudeProvider implements AgentProvider {
         } else if (message.type === 'system' && (message as { subtype?: string }).subtype === 'compact_boundary') {
           const meta = (message as { compact_metadata?: { pre_tokens?: number } }).compact_metadata;
           const detail = meta?.pre_tokens ? ` (${meta.pre_tokens.toLocaleString()} tokens compacted)` : '';
-          yield { type: 'compacted', text: `Context compacted${detail}.` };
+          yield { type: 'result', text: `Context compacted${detail}.` };
         } else if (message.type === 'system' && (message as { subtype?: string }).subtype === 'task_notification') {
           const tn = message as { summary?: string };
           yield { type: 'progress', message: tn.summary || 'Task notification' };

container/agent-runner/src/providers/types.ts

@@ -89,12 +89,4 @@ export type ProviderEvent =
    * event (tool call, thinking, partial message, anything) so the
    * poll-loop's idle timer stays honest during long tool runs.
    */
-  | { type: 'activity' }
+  | { type: 'activity' };
-  /**
-   * The provider's underlying SDK auto-compacted the conversation context.
-   * The poll-loop reacts by injecting a destination reminder back into
-   * the live query so the agent doesn't drop `<message to="…">` wrapping
-   * after compaction. Distinct from `result` so it doesn't mark the turn
-   * completed or get dispatched as a chat message. See nanocoai/nanoclaw#2325.
-   */
-  | { type: 'compacted'; text: string };